"Had, on May 16 last, J. K. Rowling put all her income from the five published Harry Potter books on Archer’s Folly in the 3.15 at Haydock Park, which came in by a short head at 100-1, she would have become richer than Bill Gates by £135.84. If, though, she had waited until this week’s publication of the sixth book and put all her accumulated money on Jiminy Cricket in the 2.45 at Sandown, she would now be in a position to buy North Dakota."